Struct futures_util::stream::Unfold

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#[must_use = "streams do nothing unless polled"]
pub struct Unfold<T, F, Fut> { /* fields omitted */ }

[−] Expand description

A stream which creates futures, polls them and return their result

This stream is returned by the futures::stream::unfold method

Trait Implementations

impl<T: Debug, F: Debug, Fut: Debug> Debug for Unfold<T, F, Fut>

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fn fmt(&self, f: &mut Formatter) -> Result

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Formats the value using the given formatter.

impl<T, F, Fut: Unpin> Unpin for Unfold<T, F, Fut>

impl<T, F, Fut, It> Stream for Unfold<T, F, Fut> where     F: FnMut(T) -> Fut,     Fut: Future<Output = Option<(It, T)>>,

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type Item = It

Values yielded by the stream.

fn poll_next(self: PinMut<Self>, cx: &mut Context) -> Poll<Option<It>>

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Attempt to pull out the next value of this stream, registering the current task for wakeup if the value is not yet available, and returning None if the stream is exhausted.